quoted failure rate (λq)

The predicted failure rate for typical operating conditions.

NOTE The quoted failure rate is calculated from the observed failure rate under accelerated stress conditions multiplied by an acceleration factor; e.g., λq = λo ∙ AT, where λq is the quoted (predicted) system failure rate at some system temperature Ts, λo is the observed failure rate at some test temperature Tt, and AT is the temperature acceleration factor from Tt to Ts. When multiple failure mechanisms and thus multiple acceleration factors are involved, then a proper summation technique, e.g., sum-of-the-failure-rates method, is required.

References

JEP122E, 3/09
JEP143B.01, 6/08

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